Eras

Question 1

Place all of the eras in order.

Answer 1

Precambrian
Paleozoic
Mesozoic
Cenozoic

Question 2

List important events from the Precambrian era

Answer 2

• Formation of the solar system
• Formation of Earth
• Appearance of prokaryotes (single cell, no nucleus)
• Appearance of eukaryotes (have nucleus)
• First multicellular organisms
• Appearance of Ediacaran Fauna! (absorbed nutrients, reproduced)

Question 3

List important events in the Paleozoic era

Answer 3

• Continents continue to drift
• Appearance of plants(ferns, conifers), fish, amphibians, reptiles
• First animals with vertebral column
• First mass extinction
• Second mass extinction
• Third mass extinction

Question 4

List important events in the Mesozoic Era

Answer 4

• Appearance of dinosaurs
• Appearance of small mammals
• Fourth mass extinction
• Pangea divided into two continents
• Fifth mass extinction (meteor)

Question 5

List important events of the Cenozoic Era

Answer 5

• Long cooling period, draught
• Mammals thrive
• Appearance of megafauna
• Appearance of humans